Kinda in the same boat but there is a solution less than a new battery and box.
This will solve future acid issues and can leave the old box with holes in it depending how big those holes are.

http://www.cessna150152.com/forum/ubbthreads.php?ubb=showflat&Number=420626#Post420626

https://www.aircraftspruce.com/catalog/elpages/odysseydry9.php
https://www.aircraftspruce.com/catalog/elpages/odysseydry7.php


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